Most of us have been there: You're out taking photos and your memory card is full, but you don't have another with you. Or ...

To maintain compatibility with your digital camera, do not change the default settings for the card's file system or allocation unit size. Click the "Start" button to format the SD card.

You must format an SD card prior to using it for storage. However, if you format the SD card into more than one partition, you can only use the active partition on the card. To delete partitions ...